- Have been receiving pre-study treatment that includes at least 10 mg/day prednisone (or equivalent dose of corticosteroid) as a single agent, or 1 or more immunosuppressant (e.g., methotrexate, azathioprine, cyclophosphamide, chloroquine, leflunomide, hydroxychloroquine, mycophenolate mofetil, cyclosporine, tacrolimus, corticosteroids) for at least the 3-month period immediately prior to screening. Subjects must be on a stable dose of these medications for > 4 weeks before starting the study medication.